"70-90 years oscillations in global mean temperature are correlated with corresponding oscillations in solar activity. Whereas the solar influence is obvious in the data from the last four centuries, signatures of human activity are not yet distinguishable in the observations."These solar influences have been very marked in recent centuries. The 'Little Ice Age' which corresponded to the Maunder Minimum in solar activity (1645–1715) was a period of cooling when the River Thames froze repeatedly to such a depth that frost festivals were held on it. Earlier still, the Medieval Warm Period of the 12th and 13th centuries saw global temperatures significantly higher than today. These events are well documented in historical records well before any cars or factories existed. Solar influences can explain both, carbon dioxide emissions cannot.
Solar System photo-diagram. Source:NASA